I have purchased a a galaxy note 10.1 (2014) recently and it seemed to work fine but a few days ago i noticed that the menu and back buttons don't work when i use my fingers.It works when i use my stylus though .
Does anyone know what's wrong it?
This won't solve your problem but handy soft key is a good way to save the hard buttons and get access to your controls the free app is very good and the pro gives a bit more customization.
Also experiencing exactly these symptoms. Also if I touch just to the right of the back button both buttons light up both do nothing? Very odd and annoying.